What Is the Glowworm F22 Fault Code
The Glowworm F22 fault code shows low water pressure in your heating system. Your boiler needs the right pressure to circulate hot water. When pressure drops too low, the system stops working and displays the F22 error.
In most cases, this happens due to a leak in the pipework or a gradual loss of pressure over time. You may also see a number like 0.3 on the display. This number shows the current pressure level, which should stay around 1 to 1.5 bar.
You can check the pressure using the gauge on your boiler. If the reading is low, you need to take action quickly to restore normal operation.
Table of contents
Why Does Your Boiler Lose Water Pressure
Boilers lose pressure for several common reasons. Over time, wear and tear can affect components and reduce system efficiency. Small leaks in pipes or joints often cause pressure loss.
If you recently bled your radiators, this can also lower pressure. Air may enter the system and disrupt water flow. In some cases, parts like the expansion vessel or pressure relief valve may fail.
Pressure loss usually happens slowly. If you notice a sudden drop or need to refill often, you likely have a deeper issue that needs repair.
What Causes Glowworm F22 Fault Code
Low Boiler Pressure
Low pressure is the main cause of the F22 fault. The boiler cannot move hot water properly when pressure drops below the required level.
Blockages in the System
Sludge, debris, or limescale can block pipes. These blockages reduce water flow and trigger the F22 fault.
Air in the System
Air trapped inside pipes disrupts circulation. This often happens after bleeding radiators or due to airlocks in the system.
Signs and Symptoms of F22 Fault Code
Boiler Displays F22 Error
The display will show the F22 code when pressure drops below safe levels.
Heating Does Not Work Properly
Radiators may stay cold or heat unevenly. In some cases, the system stops working completely.
Unusual Boiler Noises
You may hear gurgling or banging sounds. These noises often indicate air or poor water circulation.
You should not ignore these signs. Quick action can prevent costly damage.
How To Fix Glowworm F22 Fault Code
Time needed: 5 minutes
Follow the below given steps to fix the glowworm F22 fault code
- Check Boiler Pressure
Look at the pressure gauge on your boiler. The reading should stay between 1 and 1.5 bar. If it is low, this likely caused the fault.
- Inspect for Leaks
Check around the boiler and pipes for leaks. Even small drips can reduce pressure over time.
- Repressurise the Boiler
Use the filling loop to increase pressure. Open the valves slowly and stop when the gauge reaches the correct level.
- Reset the Boiler
Press the reset button after fixing the pressure. This step may clear the fault if the issue was temporary.
If the problem continues, contact a qualified engineer.
When To Call A Professional
You should call an engineer if:
- Pressure drops frequently
- You cannot find the cause
- The boiler keeps showing F22 after reset
A Gas Safe engineer will inspect the system, fix faults, and ensure safe operation.
Conclusion
The Glowworm F22 fault shows low water pressure in your heating system. You can fix simple issues by checking pressure and topping it up. However, frequent pressure loss often points to leaks or faulty parts.
Act early to avoid bigger repair costs. Regular boiler servicing will help you prevent faults and keep your system running efficiently.
Frequently Asked Questions
The F22 fault is usually triggered when the water pressure drops below the recommended level, often due to a loss of water in the system. The ideal boiler pressure should be between 1 and 1.5 bars. If it’s lower than this, that’s likely the cause of the fault.
Using the boiler while the F22 fault is active is not advisable. This error points to potential problems that could affect the boiler’s efficiency and safety. It’s important to resolve the issue before resuming regular use.
The F22 boiler is equipped with a safety switch-off mechanism that activates automatically when it detects issues like low water pressure. This feature is designed to protect the boiler from potential damage and to keep users safe.
An F13 fault code relates to a faulty sensor within the dryer heater assembly. Hotpoint have changed the design of the sensor from this, to this, so if you have this type of sensor in your machine and you’re experiencing an F 13 fault we recommend you change it to this sensor.
